Rotating-cylinder internal-combustion engine.



P. G. TACCHI.

ROTATING CYLINDER INTERNAL COMBUSTION ENGINE. APPLxcATxoN FILED Nov. 9, 19'17.

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Patented Dec. 17, 1918.

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Inventor.

P. G. TACGHI.

RoAING CYLINDER INTERNAL CoNIBusTIoN ENGINEI APPLICATION FILED NOV- 9I 1917.

Patented Deo. 17,1918.

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UNrTED sTArEs PATENT oFFrcE.

PERCY GEO. TACCHI, 0F NEW WANSTEAD, ENGLAND, ASSIGNOR TO CENTRUM SYNDICATE LIMITED, OF TOLLINGTON PARK, LONDON, ENGLAND.

BOTATING-CYLINDER INTERNAL-COMBUSTION ENGINE.

Specication of Letters Patent.

Patented Dec. 17, 1918.

Applicationled November 9, 1917-. Serial No. 201,038.

T 0 all whom it may Concern: y

Be it known that I, Pnnov GEORGE TACCHI, a subject of the King of Great Britain, residing at Bay Tree House, New Wanstead, in the county of Essex, England, have invented certain new and useful Improvements in Rotating-Cylinder Internal-Combustion Engines, of which the following is a specification.

rllhis invention relates to two stroke internal combustion engines of the type in which rotating cylinders carry pistons that act-outwardly against a fixed cam track causing rotation of the cylinders.

According to this invention the inward or compression stroke of the pistons draws a charge into the fixed engine casing, which charge is then compressed in the casing on the outward or working stroke of the pistons and is admitted to the combustion chamber through an admission valve or valves after the exhaust is opened. lIn the preferred construction the cylinders open to a common combustion chamber between the pistons and the admission valves are situated between the cylinders and are opened against light. spring pressure by the action of the cam track, or when the pressure in the combustion chamber 'falls on exhaust below the pressure in the casing, which may amount to about 5 lbs. per lsquare inch.

In order that ythe said invention may be clearly understood and. readily carried into effect, I will describe the same more fully with reference to the accompanying drawinos. in which Aigure 1 is a vertical section of a two piston engine embodying this invention;

Fig. 2 is a part cross section, part end elevation of the said engine. v

. Fig. v3 is a half elevation, half section of the vcylinder casting. l Fig. 4 is a half elevation haltl .section of the cylinder casting at right angles to Fig. 3' and I 7Fig. 5 is adetail section" of an exhaust port in thelcylinder. l y

InFigl, for convenience of illustration, the lower part .of the cylinder casting is shown asturned through a right angle as compared with the upper half of the figure which shows a section of the admission valve at the upper side and a longitudinal section though the cylinder and piston at the lower s1 e.

A is the cylinder casting, of circular or disk form in end elevation as shown in Fig. 4, and bored transversely with the cylinder B which forms two opposite cylinder elements receiving thev oppositely acting pistons C, between which is the common combustion chamber' Dr The cylinder casting is fixed upon the hollow shaft L. E is the fixed engine casing made in two halves bolted together. F is the cam track. G, G are the inlet valves H is a suction valve through which the explosive mixture is drawn into the casing E, the valve rod h being operated at the required intervals by the cam it on the rotating cylinder casting A. J is a magneto for ignition of the compressed charge in the cylinder B through the sparking plug The cylinder B isprovided with a pair of exhaust ports b (one of which is shown in Figs. 4 and 5) extending through a substantial arc and uncovered toward the end of the outward-piston-stroke, the exhaust ports leading through one end tace a of the cylinder casting A and registering during the exhaust vperiod with corresponding ports e in the fixed engine casing E, which ports open into the exhaust pipes K. The casing is conveniently made in two halves or members bolted together by the bolts e with the outer edge f of the cam track between the members, an 4auxiliary cam track F for moving or holding the pistons out when unsupported by internal pressure being provided at one side, by means of a cam shaped groove in the inner face of' the casing into which a pin or roller 0 (Fig. l) onv the side of ea'chpiston C projects. The. auxiliary track F follows substantially the outline of the main track F. The main Ycam track F is preferably central and large rollers c carried by the pistons travel over it, the track, inthe case of the two piston engineshown, being symmetrical and usually comprising two rounded ends (preferably idly mounted. .The gap! or channel a3 4mits ofthe passageoff'the .track Fi.

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of the revolution) with a straight or Slightlyd curvedintervening portion f2. The corners f3 Wllielugr@ tbewmrressou Stroke are' A struck froi'iralarger radius than ythel corners f4 which terminate the outward stroke or the pistons, see Fig'. 2. The` cylinder' castr ing A is provided with valve apertures a between the cylinders andrin the same plane,

the valre'casingsg with the inletV valves G being secured inthe apertures c. The valve stems g project outwardly so as to meet the contracted (straight orslightly curved) portion f? of the .cam track F during the transerperiod when the explosive mixture is beingadmitted from. the casing E to the cylinder B. The valves G are as shown inl Figs. 2 and 4 set' at an angle, the direction of slope depending on, the direction of 'rotation of the engine. In the yvalve.section inlig. l, howeVer,'. the .section is'takenthrough the valve axis for-'convenience of illustration. .'ilhe cylinder` casting. vis hollow andy water circu lates through fthe cooling spaceazfbeing suppliedcthroughthe tube 'Z passing through the hollow-shaft L1 on wliichithe casting .is rigper- The following Aisthe cycle. ofthe twopiston/engine illustrated f .Starting with the pistons C atthei'r outermost fpositi'oinjwith the.` cylinders 1B' vand valvesk G in the position shown in dotted llinesin liig;v 2, 'the inlet valves G/arefopen and the exhaust `ports o' 'are also :fullyeopen but close shortly after the pistons Cb'egin their `inward stroke. .Therst'ems g" l'ofthe inlet wValves-GA then' leave the cam track F and the valves close,l whencompressionrbegi-ns and',continues:until'the pistonsare 'at :right-angles tothe initialposition, with the.

vrollers cfatthe-most contracted portion of the camf track. 'In the meantime a fresh Vchainge-has been drawnby the inwardmove mentiof the pistons C through the suction value1-I into the engine casing E,'a carbureter (not show-n) being 2fitted to the bracket it? (Fig: 2) on the valvefcasing h3. Ignition ofthe compressed charge between-the' pis#l tons@ takes place and the working stroke occupiesmost of the second quarter of the f revolution, the kpiston rollers Lc" pressing outwardly'againstthe 'expandingfportion f2, )atY of the cam track. *Compression of the new charge 'in the casing lil-#occurs during- 'the working stroke, up l"to-say l5 lbs: yper Ysquare inch.

' Before reaching {the 'end of ALJthe outward strokethe double exhaust isfopen'e'd,V Athe pis'- tonszuncoveringfthe ports b atfthe outerjends 'the cylindersfwhich ports already regis,- ter Vwith lthe casing ports e, and the internal :nascere pressure falls. When the pressure falls sufiicientlyV theV inlet valves VGr open .(theyanay open automatically) and the enteringcharge eXpels the waste gases in both directions thlQugh the exhaust-,ports- .ls theharge enters at the middle of Vthe Vcombustion chamber D andl drives out'thec'exhaust at both ends, .thelengthof travel of the gases is very small, only" about "a quarter of the travel of. the gases of a single cylinder twostroke engine of the same power. 'Thevalves G'arefmaintained open bythe track F but the track is arranged not to open the valves mechanically before the exhaust po'rtsi')v` are well open.. At lowspeeds automatic opening of the valves Gwould occur but atV high speeds the Valvesmight remainclosedxuntil' mechanical openingoccurs. The track F insures'full opening of the Valvesatany speed andalso vinsures the admission oia inrture-A which may?, by reason of throttlng be at too low a pressure` to open -thelvalyes automatically. The-complete cycle occupies only half a revolution: sogthatfthereare two double 1 piston' workingstrokesat each revo lation.

This invention has beende'scribed more-esi `pecially as applied to a'double-piston engine act,` casing,"ineanslffor admittingfan' feX- plosive `charge to `the 'said y"c'asmgfon the 1n-l ward or compression stroke of thepi'stona, f

which char-'ge is compressed in the casing by the outward stroke of therpistonsy'a non-re-y turn v valve admitting' the 'compressed charge tothe working space' othe cylinder yand i-neansfor opening thesaid valve afterithe Y' 'exhaust has been opened.

2. ln an engine 'as'fcl'aimed inclaim 1,'a

member onv the aforesaid va"dini'ssi'on 4valve, adapted to meet the cam track 'and toopen the valve, aterftheopenin of fthe exhaust under the ycontrol of the said track. f

cylinder, open to a common combustion' chamber 'and V'acting outwardly Vagainst the said 'cam' track, 'ae'ixe'd .casing incflosing the 3. In a twostr'oke rotary 'cylinder inter cylinder casting and providingra spacelfor admission and compressionofan explosive charge during the inward and'outward'pistonV 'strokes respectively,v an inlet-vr valve 'in the cylinder casting opening the casing space to 'the Vcomlnistion Ychamber and'l meansv 'for opening the said Valve after the exhaust has been opened, for the purpose specified.

4. In an engine as claimed in claim 3, wherein the cylinder casting is of disk form and has inet valve apertures at right angles to the dianietricai cylinder and a pair of exhaust passages extending from the cylinder to openings in one end face of the said casting, and the fixed casing s of disk form and has exhaust ports in one side adapted to register with the ends 0f the exhaust passages in the cylinder casting during the exhaust portion of the engine stroke.

PERCY GEO. TACCHI.

Gopies of this patent may be obtained tor ve cents each, by addressing the Commissioner of Patents. Washington, D. C. 

